If EdgeTX conditions overlap, the servo will stop moving.

[masuta010]

Transmitter, RADIOMASTER XT12 EdgeTX-MPM
Receiver, FUTABA R2008SB
Model, crawler rover

I introduced it to operate a crawler rover, but it moves strangely, so I would like some advice.

MIXES
　CH1　-100IThr
　+＝　 -100IAil
　CH2　-100IThr
　+＝　 100IAil
　CH3
CH4 100・S2
CH5 100! SC
　CH6
　Ch7　-100! S.A.

I have assigned the servo to Ch4 (S2), and it works without any problems as soon as I turn on the power.
CH5 (SC) and Ch7 (SA) are assigned relays, and when the relays are turned on, the brush motor rotates, the turret rotates, and the gun barrel moves up and down.
CH5 and CH7 don't seem to be affected that much, but the problem is the servo connected to CH4 (S2).

I turned on the power and checked the operation of each CH without any problems, but for some reason the servo of CH4 loses output when I move the crawler forward with CH4 fully up (+100).

There is no mixing involved and I don't know the cause.
What is the cause?
What should I do to find the cause?
Please lend me your wisdom.